Couplage d'une pile à combustible avec des supercapacités pour étudier les gains en termes de rendement et de durée de vie

Abstract : Fuel cell are an electrochemical devices wich convert chemical energy into electricity. In this study we focus on PEMFC Proton Exchange Membrane Fuel Cells fede by hydrogen and air. This kind of fuel cell has many advantages and show extensive application potentials. If PEMFC exhibits good power capability during steady-state operation, the slow response during transient peak power demands has restrained them for being used in large-scale and high-power transportation applications, such as automobive. To overcome these difficulties, a variety of research has been carried out on the development of hybrid systems based on supercapacitors or batteries. In this work, we study the effect of passive hybridization to improve the system performance and reliability, more specifically during steep load variations. We show that SC can provide a sufficient amount of power to the system during the short time needed by the gas supply lines to respond to an increase in power or current density. This makes it possible to always feed the fuel cell with the right amount of gas without anticipating current peaks or load variations. Flat supercapacitors were also designed and made within the framework of this project. The aim was to design cheap and safe SC with materials like activated carbon electrode and LiNO3 as the electrolyte. In this study we also showed how a direct passive hybridization of PEMFC with small aqueous supercapacitors brings to the design of more efficient, simple and reliable FC systems. By using transient load (Heaviside steps), we showed that the direct hybridization of PEMFC with SC allows to extend its lifetime
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Submitted on : Thursday, April 11, 2019 - 2:39:58 PM
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Said Ait Hammou Taleb. Couplage d'une pile à combustible avec des supercapacités pour étudier les gains en termes de rendement et de durée de vie. Génie des procédés. Université de Lorraine, 2019. Français. ⟨NNT : 2019LORR0011⟩. ⟨tel-02096644⟩

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